21010120100220 has 96 divisors (see below), whose sum is σ = 62501417391168. Its totient is φ = 5255131082752.

The previous prime is 21010120100197. The next prime is 21010120100273. The reversal of 21010120100220 is 2200102101012.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 21010120100196 and 21010120100205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34851579 + ... + 35449298.

It is an arithmetic number, because the mean of its divisors is an integer number (651056431158).

Almost surely, 2^{21010120100220} is an apocalyptic number.

21010120100220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21010120100220 is an abundant number, since it is smaller than the sum of its proper divisors (41491297290948).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21010120100220 is a wasteful number, since it uses less digits than its factorization.

21010120100220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70301199 (or 70301197 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21010120100220 its reverse (2200102101012), we get a palindrome (23210222201232).

The spelling of 21010120100220 in words is "twenty-one trillion, ten billion, one hundred twenty million, one hundred thousand, two hundred twenty".